static int iss_net_configure()

in platforms/iss/network.c [506:588]

• 53 lines of code
• 5 McCabe index (conditional complexity)

static int iss_net_configure(int index, char *init)
{
	struct net_device *dev;
	struct iss_net_private *lp;
	int err;

	dev = alloc_etherdev(sizeof(*lp));
	if (dev == NULL) {
		pr_err("eth_configure: failed to allocate device\n");
		return 1;
	}

	/* Initialize private element. */

	lp = netdev_priv(dev);
	*lp = (struct iss_net_private) {
		.device_list		= LIST_HEAD_INIT(lp->device_list),
		.opened_list		= LIST_HEAD_INIT(lp->opened_list),
		.dev			= dev,
		.index			= index,
	};

	spin_lock_init(&lp->lock);
	/*
	 * If this name ends up conflicting with an existing registered
	 * netdevice, that is OK, register_netdev{,ice}() will notice this
	 * and fail.
	 */
	snprintf(dev->name, sizeof(dev->name), "eth%d", index);

	/*
	 * Try all transport protocols.
	 * Note: more protocols can be added by adding '&& !X_init(lp, eth)'.
	 */

	if (!tuntap_probe(lp, index, init)) {
		pr_err("%s: invalid arguments. Skipping device!\n",
		       dev->name);
		goto errout;
	}

	pr_info("Netdevice %d (%pM)\n", index, dev->dev_addr);

	/* sysfs register */

	if (!driver_registered) {
		platform_driver_register(&iss_net_driver);
		driver_registered = 1;
	}

	spin_lock(&devices_lock);
	list_add(&lp->device_list, &devices);
	spin_unlock(&devices_lock);

	lp->pdev.id = index;
	lp->pdev.name = DRIVER_NAME;
	platform_device_register(&lp->pdev);
	SET_NETDEV_DEV(dev, &lp->pdev.dev);

	dev->netdev_ops = &iss_netdev_ops;
	dev->mtu = lp->mtu;
	dev->watchdog_timeo = (HZ >> 1);
	dev->irq = -1;

	rtnl_lock();
	err = register_netdevice(dev);
	rtnl_unlock();

	if (err) {
		pr_err("%s: error registering net device!\n", dev->name);
		/* XXX: should we call ->remove() here? */
		free_netdev(dev);
		return 1;
	}

	timer_setup(&lp->tl, iss_net_user_timer_expire, 0);

	return 0;

errout:
	/* FIXME: unregister; free, etc.. */
	return -EIO;
}